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How-to: Access & Read Trouble Codes

For anyone who has ever owned a GMC Syclone or Typhoon know all to well the check engine light and it's glowing presence means that there is something not quite right with your beloved truck.

These trucks use an OBDI system that utilizes an ALDL (Assembly Line Diagnostic Link) terminal to be able to acquire data from the 7749 ECM. Luckily, to be able to check and read codes, you dont need any equipment short of a paper clip or simple ALDL Jumper Key that I've seen for free at your local auto parts store.

Below covers the steps in how to pull up and read your CHECK ENGINE codes as well as a list of what each code means.